Rotary pump.



W. S. EASTON.

ROTARY PUMP.

APPLICATION FILED 1AN.|1,19|1.

Patentd M1223, w18.

2 SHEETS-SHEET I.

W. S. EASTON.

ROTARY PUMP.

APPLICATION FILED JAN. 11. mz.

' Eatented Apr. 23, 1918.

Z SHEETS-SHEET 2.

orribn.

isomer BUMP'.

racines..

Applicationfilew `January ,17; i911?. Serial No.. 142,941.

To allwhmzw't may concerns Be it known that I, WILLIAM S. Easton, a citizen of the United States, and resident of the city ofSeattle, coun-.ty of King,v and State of Washington, haveiniventedz certain new` and useful Fmprov,ements` in Botany Pumps, ofi which the following is a speciti cation.

Myv invention. relates tolpumps of the: type which` employ. rotaryimpellerslv `My: invention comprises certain., featuresiof constructionjby, which the facility of? operation, of the: pump is improved and the details; of construction Simplified and also improved. My invention comprises theY parts and combinations thereof.: which willbe `described in the specification and ltheir particularly pointed out in the claim. The accompanying ldraw'ings showimy invention in the form o-f construction which is now preferred by.' me.

Figure 1 is a top or plan view of theV pump, showing one bar broken away to better illustrate the construction.

Fig. 2 is a side elevation of the same pump.

Fig. 3 is a. transverse section on the line 3-3 of Fig. 1, the same being through the impellers and the inlet and discharge ports.

Fig. 4 is a section on the line 4-4 of Fig. 1, or through the bearings at one end.

Fig. 5 is a longitudinal section taken on a vertical plane through one of the bearings.

With my pump ll employ two shafts, l and 2, placed adjacent each other and parallel, and upon these are mounted two impellers, these being provided with cylindrical portions which turn substantially in contact with each other, of which one impeller is provided with projecting vanes, while the other is provided with recesses adapted to receive and pass said vanes. The two shafts are connected for synchronous rotation by means of intermeshing gears 7 and 70. placed on one end thereof.

rll`he impellers are of substantially the cross section shownin Fig. 3. The impeller 10 hasvanes 11 projecting therefrom, having four in number as shown. The impeller 20 has recesses 2l of such size and shape as to receive and pass the vanes l1 ofthe other impeller. Two such recesses are shown.

The gears 7 and 70, which are secured to thek same shafts, bear a ratio of two to one, so that the impeller 20 turns at twice the rotative speed of the impeller 10.

ings 4 from the The two impellers;V are; inclosed 'within a casing 3, winch.` is of such` size as to. iit closely,

but not tightly, against the outer rotative surfaces;` ofv such inapellers. Il prefer to have this connection as tight as may feasibly be made without. having actualcontact. this may; produce. a slight leakage baclrvvarr-l in the. pump, it will reduce friction, losses'.

Casing 3. has a discharge passage 32 and an inlet passage 3l. The shafts l and? 2: are

Vilhile Sneccatipngof Letters-Iatent.l Patented Apr. 23,. lLH'ldf.

preferably placed with the shaft 2, whiclli carries; the smaller ofthe two inapellers,V a

slightly higher level. than the other shaft 1 andthe inl-et passage 31 enters theimpeller chambenfromfa horizontal direction` imnie.-

diateliyfbelow the impeller 20, and has` its lowermost edge;l siilticiently above they l'ozwrn:- most; point of the2 impeller chamber, to pro- 310, which water will/be trapped when the pump is stopped. The purposeY off this is to. insure that the pump willfat all times contain a sufiicient amount of liquid to insure priming. The shafts, on leaving the impeller chamber, pass through stuffing boxes 33.

The pump casing is centrally placed upon a base 9, and upon the ends of the base are secured pillar blocks or bearing supports for the shafts which supports are spaced away from the pump casing. By reason of this arrangement, I am enabled to employ stu ing boxes 33 and thereby prevent leakage about the shafts. The spacing of the bearpump casing is enough to permit withdrawal of the followers 34 for repacking. Providing the additional bearings 4 at each end of the shafts, these being independent of the bearings in the pump casing, relieves the latter bearings of con`v siderable strain and, therefore, aids ,in keeping a .tight joint about the shafts.

The bearings, on the ends of the shafts are, to a certain extent, special in construction. Such bearings are shown by the two sectionsof Figs. 4 and 5. The pillar block, or stand, 4, is made hollow to act as an oil chamber for the reception of oil with which to lubricate the bearings. The lower side ofthe bearing is provided with a hole, or

holes7 through'which may pass the two sides is toward the chamber 3, is preferably provided With grooves cut therein after the style shown at 12 in Fig. 5 and Fig. 1. Y Ifhe stand 4 is provided with outwardly extending flanges 41 which provide a slight chamber which -embraces the threads 12 eut in the shaft. This chamber is provided with a storage channel 42 which connects With the chamber in the base of the bearing. Any oil Which Works through the bearing in this direction is stopped by the slight flanges 12 and Whatever drips therefrom is immediately drawn back into the oil storage eham ber 40.P

At the other side of the bearing the stand 4 has anges 6 which form a case for the gears. The gears 7 and70 are secured to this end of the two shafts and intermesh. The lower edges of one of these gears dips into the oil in the storage chamber, thus maintaining lubrication upon the Wheels at all times. Ther oil which comes from this end of the bearing is sufficient to maintain lubrication for the gears. The bearing is covered by a cap 43 which has, as a part thereof, a flange Which forms the upper Vhalf of the gear case and also a flange V44, which forms the upper half of the oil interseeting chamber at the other end of the bearing. Upon one of the shafts a pulley ing pocket 30 is suflieient to insure priming l and prompt starting of the pump. lVithout this a pump, in order to Work under suction, would have to be primed every time it is started.

lV hat I claim as my invention is:

A pump having two intermeshing rotative impellers and a casing inclosing said impellers, said impellers being located to bring one shaft at a slightly higher level than that of the other, the casing having a discharge opening at its upper side and an inlet passage extending horizontally froln its lower side beneath the higher of said impellers, the bottom line of said inlet passage being above the bottom side of the chamber conf taining the loWermost impeller to thereby provide a priming pocket.

Signed at Seattle, Washington, this 12th dayV of January, 1917.

WILLIAM S. EASTON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

